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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ca46d70304e7ac31f45a09a180d6573745e6a1c2d11c09293713b7cdee57c8' 
  AND token = 'fZ8hc8d2dB7X87p4wJbQg1gJgm8G8vTkzX714IH8bm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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