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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8576ee0e82b3740a35ed4a35de431d419571e3dc934a02fff7ac5d22f35edc9' 
  AND token = 'yyHqSbOT3t8b7jiQ97td2gHIOtDlED13S7JamjffRz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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