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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dc4222331e5da1f4d683e9d8346e6c4dfc85cb5fd548f77decaea752ef4c9a9' 
  AND token = 'Hb3UJDgs9VqchYG1I9319YxYPvCXf0Nc3R7xFolhYH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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