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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea3c7fcb8a18ab6ef5c304cf79ed5d3a0ad65aed097bb1c2dd86cf0b0cef85b' 
  AND token = 'ct9D+sfloysZkmvWO2wVNRDEsfDLt0meiBTd97Jag/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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