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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9f15e7ee36a2269f9a245e2359fee40cc9989c9293773123e86e5792962e5a' 
  AND token = 'rzy9/OdXpgLR5w+tdYDIDhEBoFEb8PklAnsugz+vjOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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