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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7053f89a8f6c4cb9812a696eff823c924f046d634e9b126599bae73c03cf92a' 
  AND token = 'WoQJM8MID4V/OSGBsAMe52vvS2ejYmSJJAGT2sUc3xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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