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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0733042b3f7d667fcbedd99f718db113f9ec25d0d02e31d5a574df0d2fa4e6f2' 
  AND token = 'SZJrhV5p68RPj5R0jGZt4vlWgf4Ms1J8B0/r6QRwk14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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