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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab96104097a8afb5cacb0c95bf70f620c10b5a03ff3bf5e903d8a8774305c9c' 
  AND token = '4C9aoaCoHL7q84mKv0T3zxvztbvCNvgN0RH42W1vyeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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