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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f888c73be1f3a5db398b13df47f8529fc0a4af0a30bc2995c461ec77000c34ce' 
  AND token = 'izeVnH7/Fkl/fmsmWaseAJWm+3+BZTMHwaExRLv6/6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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