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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934de060ca7075c9f54918f88adf04266a9027cadf3edec8a61e05a744738dc6' 
  AND token = 'm04vjPLNbNYXsRCxPGo2Sf4KmSuiiZ52A0SNV0hUFOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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