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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e3668c31fe93e97d1059a93bd5295c95f59577790e1f66ea0f9960e008d804' 
  AND token = 'VA8NDmwYK0NmQlH35L1Wcx0xeBL8OlcSnFWFasfGtSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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