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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693c2007bc697020e3c517a229d82a5a802098b47c042d65ec97ae4a9d279969' 
  AND token = 'oYH9Ym/x+AiLU2R5KM8Kr9fyKL7WriyNQ/D/RwA0NJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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