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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca5d8d7d5a3402b24ed968614fe4dd0608de2ac252c96a58af07be29d22eddd' 
  AND token = 'LUSGyd4/BTuRmGlzbH36Hq7Me94qxXcn21TmOIRdBLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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