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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7660524432f2e2844cfe7cb317d52e92587436744c30ed70b69ff1ab6483e322' 
  AND token = '1EA7qWhW7IKuGW15iRZUTBzyWt+B6AiV2EHXWGlwDy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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