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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1faed906ab6bffa04d98649f689c9d0b67aa009cafa9cdedc2d5b70d50d75602' 
  AND token = 'Im1w41/4viDWfT5Q/L5QlK5mKdxZNABLkSPNAWANi6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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