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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ffb3f91c34c678e69b3dab97511dc93f585da376dfb8d104112e58d1d7ccdbb' 
  AND token = 'UUaSR/SwGGMLVebcNUGIqbf3FpR3+XgUXhScDzwIIiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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