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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec69d396e8974ebcf3ec4167af5db99d85114ac96280ad105f159d9da059740' 
  AND token = '5IlAraBGlkKZ6loOJHy8O9cJYFCxCthN04fhI+lXi9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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