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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12119808a65ca8695d29fb0aa4b0cc25d76bd84ed80acbbf155d97092d1d5636' 
  AND token = '247KO81ULtsEPhJZ/3zzco1XrcUU31/5cbwiNrXbpLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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