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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb36a62a075621cd28e86d164568af442888119b09cbd9f82b39ba3ac14b609' 
  AND token = 'HKiefeLIdpBvek0hagogeYSj1HiXKz21smniDQf2Q1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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