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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a0034a2a74f9cf4ac049c4ef8b70c6af5052d5313dfdc62c034ae3917b6039' 
  AND token = 'i+FRS3F6vOFxa6NuAYXhM1b9IUO+ZPMEXRyPrlMU24Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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