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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b7ac992192ee8d92de4eeaea42090282996dc80a3da6b74b0dc51c719c97f3b' 
  AND token = '7h2hs7co7qZ6P4kQUpbtMMmn9ed2nUEpD7u5JOE4M2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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