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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f2f622695635aae480832a9f83812ba51eee2fe7974de6493b3acd05cd88153' 
  AND token = '5VjBbz78rlEk68D7nK4jxRyxu0bmfFi0Rzz/JM8m9UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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