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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c22995e3314addbefb51990bf65a3031993789aaaada65a4c0af468202e46b' 
  AND token = '0/wX5jVMVvr/bTen3nvZCPsRzF6n/Z6XsRqkinFI83s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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