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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38273155ab74c8686878b074b8bf6d1cf200e8994eafbe0711a09bb8c23c41a2' 
  AND token = '5wEHbko5p7aS07xHXwYoP8EPn3BMLf18Uege5OXid98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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