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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a4c6e7a6a593983408339cae70ea7a49cfc0d7c5afd2066a58d07b0a0c46be' 
  AND token = 'UaNbjdnS8Lp/X87UC4KB8vA6luR8J28pZuJn9e5eb7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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