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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9724e74793505fcfbe2ea3dbc3104060662321d546c8f48f0258a276bc60799c' 
  AND token = 'SPh1d6Y8JOy47jJ+6pL+Z9OQfytwHopPZO1FG6wJdQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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