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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46d4ccb05573a6f0b45712318907804f9249886736ab52dd67d6737d8b5877e1' 
  AND token = 'JEqgXSmX4Ubop6y+kYDPC3z601D0dDOx8ANXX6w0IdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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