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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab535c68cf939e3824ecfeace922f7471f9f16bc5d4a4197525eb996f2abae3' 
  AND token = 'x7dSl8sy7OCRV0X/nJ/OPCPiMyOvAxUSeNYQ4HucSgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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