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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '771c9f51b481502289749a97290ba7f5d1bbb344bb5b32a8598e801c3147bf12' 
  AND token = '7ff/M7i9d3w4mm5AtsXTx3vfIID/3uzjoNLTZvTsz6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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