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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ea86e5eafee1f80b5da1c1f02b6585bde8905eba637c39300d2dbd991deca61' 
  AND token = 'zjSKFP+BhvBpocoW05SJPEnUkccDIq4Hs+rSZmAy758=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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