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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d14fd2044b48d0f04f6800e4c96b4fc11447302a8575ce6948681a67e3f49b' 
  AND token = 'VzFgU+8BbWpevlU/Hs5vkli/t3c3n8/ZIKr+QNKsZSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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