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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '878a5a5d647b48c18e5ffa7a2993895b7064f0bab0f5596d904d9581e4d37fac' 
  AND token = '57Y90DuOFWTvx6K88eSd3bR1aAZ1a7x537l+ylP4xkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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