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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d99298e2869ed7460ab2a1526280eaae0fc6ca1121fb63dafb2552c8a31a31' 
  AND token = '+6GIG4eDyGqdSQSKJPFHuvWN6HJNI39VXihOOVqiBiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}