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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1c7842f75fa4c185fbf0a1ca7c60993b6f6217b4e22b6bd2767d178be263bcf' 
  AND token = 'Nju3Lrqg7mWtDnQuYFWQoD3+QmEa9mFwTuzKPOFC7Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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