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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c540cabf5e2781acbcb88eb7556145fff68c333937a54ed304b66cee15b52960' 
  AND token = 'y/Y+gfHQokNZ3hKiTxm9Pe046P4pxCWJqa4/6UuZlew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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