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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be994684e3fcb1c775860c9ee2f188425fc73926760e808ceeabfec86cb96232' 
  AND token = 'iPKhNxwLeS26DQ528rfIPS8o/xL5BMDq0SS9sC6XR/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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