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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e39fbb7c571158d79b61a5e162927a1d4f153e58a459ab3dd1e65b10b7147d' 
  AND token = 'k4tHRKM0o2T1dc/wjMRxoZJ2UUFMWsNnnrBFFcKsVJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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