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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a7daa9673c68dcfd688cc634e85573f708726a4cda26183f58139b499cdde3f' 
  AND token = '1R9xpwC4qYbmhp8c7q87MjHkLAiHbGwnIa3bE7rLa6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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