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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18ba8c9d52660876958fa0eb2d0a0511ad885f56b32c0cfb73b38dd7e0dcdf08' 
  AND token = 'tjgMCButKLh2rJ7IYoQ+pPNTg5asNDrjHf3+LKsXvew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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