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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '958cecb082ca3ebb39f124caf31c9f2ad385c5a11370f61be8e213a9ea0a8fe1' 
  AND token = 'rJ2ZC+MC+qz0R/tU50Y4Z0V6CgYnmr6cB/6QLYDZLwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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