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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b937c3225e315578aebbfa19c126fc1bb992eb34def1c6bf5301b1f96366acf' 
  AND token = '6crHbFq7+mAmVdcSqPmx6M+wx4Y6uM9BbSR9uhXwSlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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