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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ac70ba45b405129fad3116f8a05356b852b8cb7a395cbeb25ce6d3b974c3e5' 
  AND token = 'nb6abxfktHz+NtT0e505xB5mQkJkC4Z0362rXyPG2LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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