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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e22bb2d43ef35091c89f4de8c9da5bf235f0f0cc5e7cd2667f5e3872e9803ce' 
  AND token = 'pK9ZdfWAUtVLV2EKwbWDkQSvK+jr/FEuzcIMWXoFqyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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