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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15d132e79e93ab8709c0e6237e89097812c40778b385064c0c2c02d5768b9289' 
  AND token = 'OCnZ5vn8DCY6bnpgNP+XhASNica34KdpByASM6cK+oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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