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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f6642023dc07f9d19360424be249e6d28c8f95dd894e810ca51f8b32b362fd' 
  AND token = 'ugRmNK6oyNG4Nfl8NjIjd9H575Hm0ep54HqNP4SIWgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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