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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ea8ec3377a415131a1e9a547b1c27a050e2c652301f493e2455ba771c2ea4e' 
  AND token = 'Pl5gETGGCu4qUotqWIP1zKJ7HckoYab314Zp1IgciVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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