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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f90374a3a385f720eb20aee2f3c2a13bfcf577cc2b12a521de4b4c3f663517' 
  AND token = 'AmlyPi0SyB008kdHRGjGOH6PI+Rb4IOfRHPdqtZ8bpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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