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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d5325ddeec51504dbbd5df94c7d94e7d4d41623dd0b4f89f499f6abe746dba7' 
  AND token = 'RmvecGJ1sDEjWmVy0p7bCFp06clzS9j6lDgwSMurgi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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